Background Gradient design changes feel like a bug

Hey there, I have a background blob that displays like a gradient for background on most of my sites. The problem is that on some sites it feels cropped at large break-points; at 1400px mark stops being responsive and full width. Funny thing is that I tried to change background image (as it’s an upload image as a background and not native gradient), and it won’t change even if I put an icon or some other image to test the problem. Setting a fixed with won’t help, and the page structure is following client-first, and it works great on other pages, but contact page seems to be an issue. Thanks for your help in advance!

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